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Table 1 Comparison of subjects who were included to those who were excluded due to missing data

From: Asthma incidence and risk factors in a national longitudinal sample of adolescent Canadians: a prospective cohort study

  Included Excluded p-value*
(n = 2,038,890) (n = 443,720)
% %
Sex    
   Male 50.0 53.3  
   Female 50.0 46.7 0.51
Age group    
   12-13 27.3 31.9  
   14-15 28.3 36.3  
   16-18 44.4 31.8 0.03
Area of residence    
   Urban 80.9 81.0  
   Rural 19.1 19.0 0.97
BMI    
   Normal 80.0 64.5  
   Overweight or obese 20.0 35.5* <0.001
Passive smoking exposure    
   Absent 59.5 63.5  
   Present 40.5 36.6 0.44
Personal smoking    
   Never/Former 83.1 87.1  
   Occasionally/Daily 16.9 12.9 0.29
Physical exercise    
   Inactive 85.6   
   Active 14.4   
Income    
   High 15.7 16.1  
   Middle 66.8 58.4  
   Low 17.4 25.5 0.27
  1. *Comparing those who were included to those who were excluded.
  2. No information was presented for the excluded population due to low cell counts.